Water Supply & DistributionQuestion 51 of 360
During rough-in you must pressure test the water piping. Which is a typical acceptable test for the water distribution system before concealment?
a.No test is needed
b.Fill and eyeball for leaks only
c.A water or air pressure test held at the required pressure for the required time with no drop
d.Run all fixtures at once for one minute
Explanation
The water distribution piping is proved with a water (or air) pressure test held at the required pressure for the required duration with no pressure drop, confirming there are no leaks before concealment. Skipping the test, merely eyeballing, or briefly running fixtures does not satisfy the required pressure test.
Law Reference: 2022 California Plumbing Code (CPC) §610.0Practice all 360 questions free — no signup required.
Related questions on this topic
- A carbonated beverage dispenser connects to the potable water supply, and CO2 can back-feed into copper tubing, forming corrosive carbonic acid that leaches copper. What protection does the code require?
- A main serves 60 WSFU predominantly through flushometer valves. Using a flush-valve Hunter conversion, this is about 51 gpm. If you had mistakenly used the flush-tank curve, you would get a much lower gpm. Why does the flush-valve column give a higher demand for the same fixture-unit count?
- What does an air gap physically prevent that a mechanical check-based device relies on internal parts to prevent?
- PEX tubing is being routed through a framing environment where it could be exposed to sunlight through a skylight for extended periods. What limitation applies?
- Where must a readily accessible full-open shutoff valve be provided on the building water supply?
- To allow individual maintenance, where does good practice and code generally require shutoff (angle stop) valves in a dwelling?
Last reviewed: · editorial process
PrepPass Editorial Team · Verified against California CSLB C-36 Plumbing Trade Examination · How we review